This object allows to configure APS channel protocol to
be implemented at Near End terminal.
K1 and K2 overhead bytes in a SONET signal are used as
an APS channel.
This channel is used to carry APS protocol.
Possible values:
bellcore(1) : Implements APS channel protocol as defined
in bellcore document GR-253-CORE.
itu(2) : Implements APS channel protocol as defined in
ITU document G.783.